Portable electric accumulator.



ATTORNEYS.

PATENTBD JULY 28, 1903.

I lNl/E/VTO/i. W

L. A. LAMMERTS.

PORTABLE ELECTRIC AGGUMULATOR.

APPLIUATION 11.21) JUNE 20, 1902.

N0 MODEL WITNESSES.-

U ITED STATEs Patented July 28, 1903.

PATE T @FFiQ-E.

PORTABLE ELECTRIC ACCU M u LATO R.

SPECIFICATION forming part of Letters Patent No. 734,896, dated July 28,1903.

Application filed June 20, 1902.. Serial No, 112,482. (No model.)

To LtZZ whom itmay concern.-

Be it known that I, LAMBERTUS ALPHON- SUS LAMMERTS, a subject of theQueen of the Netherlands, and whose post-office address is .No. 11Kalverstraat, Rotterdam, in the Netherlands, have invented certain newand use ful Improved Portable Electric Accum ulators,

of which the following is a specification.

1 This invention relates to portable electric accumulators-that is tosay, small accumulatorswhich are carried by the user in the pocket orare fixed to bicycles in connection with an electric incandescent lampand the like, and has for its object to secure the conductors between.the electrodes and pole-terminals as effectively as possible fromoxidation.

It is generally known that in portable acc'umulators the electrodes andpole-terminals are connected by straight wires which are soldered to theupper ends of the terminal electrodes and thence extend upward for acertain distance, passing through-a space or chamber, into the lowerpart of which nonconducting or insulating material is cast to seal upthe cells, while its upper part, from which atmospheric air is shut outby a lid or cover, contains a gas-intercepting device.

Experience has shown that with thisshape of the connecting-wires thelatter are liable to comparatively rapid destruction, asthe jointbetween them and the inclosing material is not sufficiently tight toprevent moisture from the electrolyte or moist gases or vapors frompenetrating and attacking said wires.

According to this invention a good protection for the connecting-wiresfrom the injurious influences above named is secured by constructing theconnecting wires in the shape of cylindrically-coiled helical springs,as this shape has proved to permit the insulating material cast abovethe cells closely to adhere to and tightly surround the wires on allpoints.

On the annexed sheetI have shown in a somewhat schematical manner anaccumulator of the. type described provided withmy improvement, thefigure being a vertical central section throughthe upper part of thedevice. p r

The outer casing 1, of non-conducting material and preferably ofcylindrical shape,

contains embedded in suitable absorbing material2, (such aschemically-purified sponge,

for instance,) which imbibes and retains the electrolyteas, for example,dilute sulfuric acid-two pairs of electrodes in the form of plates 4 5and 4* 5*, separated from each To the electrodes 4 and wires 6 7, formedinto the shape of cylindrical helical springs,

are soldered or welded. The two cells are covered with thin, non-conducting, acidproof plates 8 9 of, say, indie-rubber, celluloid, orthe like, said plates being securedin the proper position by verticalgrooves 8* and 9*,into which they are engaged by small projections. Thespace above these plates is sealed up with a non-conducting material 10,such as asphalt, the sealing rising to such a level as to leavesufficient space for. the accommodation of the usual gas-collector, (notshown,) which consists in a short length of india-rubber tube 18, passedwith its ends over the open upper ends of two small glass tubes 16 and17, extending from said space down through the sealing mass 10 and theplates 8 9 into the cells, so as to constitute openings through whichgases that occur to be evolved in the cells can escape from the latterand collect in the india-rubber tube. After insertion of thegas-collector said space is closed by means of a lid or cover 11. Thewire 6 serves to make electrical connection with a pole-terminal12,fitted in the cover 11, while to the wire 7 there is soldered aconnecting-wire 13, which is conducted down-.

ward through an external groove 14, provided in the casing 1 for thepurpose and connected to a pole-terminal, which consists of a metal cap15 passed over the lower end of the casing, as is well known.

What I claim as my invention is- In a portable electric accumulator ofthe kind described, the combination with the electrodes, the terminalsand the sealing-up mass,

of connecting-wires embedded in said sealing massand formed in the shapeof cylindrical helical springs, substantially as and for the purposestated.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

LAMBERTUS ALPHONSUS LAllllllER'lS.

Witnesses:

S. LISTOE, AIRE H. VOORWINDEN.

